Sleep Duration and Mortality: A Prospective Study of 113,138 MiddleAged and Elderly Chinese Men and Women

http://www.medworm.com/index.php?rid=98637846&cid=c_64_146_f&fid=36335&url=http%3A%2F%2Fwww.journalsleep.org%2FViewAbstract.aspx%3Fpid%3D29951

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